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Checks for various problems in Struts configuration files.
<ul>
  <li>References to non-instantiable classes
  <li>References to classes that do not extend the required class
  <li>References to classes with inappropriate scope
  <li>Empty tag and attribute values
  <li>Tag and attribute values that do not match required pattern (e.g. Java Identifiers)
  <li>Tags that do not include required children tags or attributes
  <li>Tags that define objects with duplicate names
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